Description
The SONOFF AirGuard TH Lite (SNZB-02B) is a slim Zigbee 3.0 temperature and humidity sensor from the SONOFF AirGuard Series. It measures temperature with ±0.2°C (±0.4°F) and humidity with ±2% RH accuracy, refreshes its data every 5 seconds and shows real-time dew point and VPD to help you detect condensation risk early, prevent mold and keep plants in healthy growing conditions.
At only 27.8 mm wide and 20 mm thick, it supports hanging and adhesive mounting in tight spaces such as guitar cases, cigar humidors, jewelry cabinets and wine racks. Two standard AAA batteries give up to 2 years of battery life and can be replaced without tools, and the app keeps up to 6 months of history.
Note: a Zigbee gateway is required (see "Works With" below).
Key Features
- High accuracy: ±0.2°C (±0.4°F) and ±2% RH
- Data refresh every 5 seconds for real-time monitoring
- Real-time dew point and VPD (Vapor Pressure Deficit) monitoring
- Early detection of condensation risk to help prevent mold
- Slim 27.8 mm-wide, 20 mm-thick design for small spaces
- Hanging or adhesive mounting
- Up to 2 years of battery life on 2 × AAA batteries, replaceable without tools
- 6 months of temperature, humidity, dew point and VPD history in the app
- Voice commands through eWeLink cloud-to-cloud integration
- Works with Apple Home through a Matter bridge (such as ZBBridge-U) and with open-source Zigbee platforms
Works With
Technical Specifications
| Specification |
Details |
| Model |
SNZB-02B |
| Product Name |
AirGuard TH Lite |
| Product Series |
AirGuard Series |
| Wireless Protocol |
Zigbee 3.0 (IEEE 802.15.4) |
| MCU |
TLSR8656 |
| Power Input |
3.0V ⎓ (2 × 1.5V batteries) |
| Battery Model |
LR03 AAA |
| Battery Life |
Up to 2 years |
| Temperature Accuracy |
±0.2°C / ±0.4°F |
| Humidity Accuracy |
±2% RH |
| Data Refresh |
Every 5 seconds |
| Operating Temperature |
-20°C ~ 60°C |
| Operating Humidity |
5% ~ 95% RH, non-condensing |
| Application Environment |
Indoor |
| Casing Material |
PC |
| Color |
White |
| Dimensions |
66.3 × 27.8 × 20 mm |
| Net Weight |
43.0 g (including batteries) |
| Certifications |
CE, FCC, RoHS |
Why Choose the SONOFF SNZB-02B?
- Professional-grade accuracy plus dew point and VPD in a tiny body
- Fits where other sensors cannot: humidors, guitar cases, cabinets and wine racks
- Standard AAA batteries – easy to replace, up to 2 years of life
- 6 months of history to track long-term changes
Downloads
⬇ Download User Manual (PDF)
Warranty: 12-month warranty from the Official Distributor.
